You asked
Best camera for the pentax smc da 55mm f 1 4 sdm?
The Pentax smc DA* 55mm f/1.4 SDM is an APS-C lens, so it's happiest on an APS-C body. On APS-C it frames like about 82mm on full frame, which is a lovely portrait length. For a sensible pairing, I'd start with the Pentax K-3 Mark III, the newest APS-C body on the list, or the Pentax KP if you want another strong APS-C option.
If you already own a full-frame body, the Pentax K-1 Mark II takes this lens too, but only in APS-C crop mode, so you give up some megapixels. That's a trade I'd only make if you're already committed to full frame.
If you're shooting people, this lens is a good fit. The portraits guide explains why a longer, wide-open lens like this one flatters faces.
Written by Claude from this site's pages.